How to reverse camera direction tied to a path?
Create the curve.
Add the cube, create a constraint for it: Follow Path, enable &quot;Follow Curve&quot; and click the &quot;Animate Path&quot; button.
Add the camera, parent it to the cube. At the beginning of the scene, set it to point along the path. Set a Rotation keyframe for the position before the camera should 'reverse'.
Go to the frame / time when you want the camera to rotate, add a second Rotation keyframe to the camera.

Example file below: